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After upgrading from 14.04.5 to 16.04.1 lightdm does not start. Only
error I could find reported was:
[+0.19s] DEBUG: Launching process 1927: /usr/share/lightdm_xrandr
[+0.21s] DEBUG: Process 1927 exited with return value 1
[+0.21s] DEBUG: Seat seat0: Exit status of /usr/share/lightdm_xrandr: 1
[+0.21s] DEBUG: Seat seat0: Stopping display server due to failed setup script
[+0.21s] DEBUG: Sending signal 15 to process 1922
[+0.59s] DEBUG: Process 1922 exited with return value 0
Looking at /usr/share/lightdm_xrandr output:
#!/bin/sh
xrandr --output Virtual1 --primary --mode 1920x1200
# /usr/share/lightdm_xrandr
xrandr: Failed to get size of gamma for output default
warning: output Virtual1 not found; ignoring
# xrandr --listproviders
Providers: number : 0
# xrandr --listmonitors
xrandr: Failed to get size of gamma for output default
Monitors: 1
0: +*default 1920/508x1200/317+0+0 default
Changing
xrandr --output Virtual1 --primary --mode 1920x1200
to
xrandr --output default --primary --mode 1920x1200
leads to display of 1024x768 on a monitor capable of 1920x1200. Doesn't look
nice!
It worked with 14.04.5 seamless. I'd never had to think of it until upgrading!
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.3-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Thu Nov 24 19:19:53 2016
InstallationDate: Installed on 2014-02-10 (1017 days ago)
InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
LightdmConfig:
[Seat:*]
display-setup-script=/usr/share/lightdm_xrandr
greeter-session=lightdm-gtk-greeter
user-session=xubuntu
ProcEnviron:
TERM=screen
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: Upgraded to xenial on 2016-11-24 (0 days ago)
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
--
lightdm does not start after upgrade from 14.04.5 to 16.04.1
https://bugs.launchpad.net/bugs/1644624
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